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What happens to the electromagnet when the circuit is closed?
An electromagnet if formed by pushing current through a coil. If the circuit is truly open, current will cease to flow, thus no electromagnet.
What happens when a Diode is in reverse breakdown?
Normally,the reverse current is so small that it can be neglected.If the external reverse-bias voltage is increased to a value( 50 V or larger) ,at this stage the reverse breakdown occours
When does an electromagnet produce a magnetic field?
A magnetic field is generated whenever a current is passing through a wire.
What are the advantages of Permanent magnet over Electromagnet?
Unlike a permanent magnet, an electromagnet can be turned on and off. One useful advantage of this: Place a metal bar inside the electromagnet, apply current through the electromagnet in one direction, and the magnetic field would move that bar one way -- reverse the current reverses the magnetic field and the bar would move the opposite way. You could use that effect and make an electronically controlled lock for a door.
What are the sources of reverse current in a diode?
doping concentration,temperature are the major source of reverse current
